Water vapor permeability measurement unit and water vapor permeability measurement method

Provided is a water vapor permeability measurement unit which is provided with a water vapor detection portion for detecting water vapor, and a water vapor permeation suppression portion for suppressing the permeation of the water vapor, and configured by covering all of the outer surface of the water vapor detection portion, or which is provided with a water vapor permeation suppression portion, a water vapor permeation suppression portion for suppressing the permeation of water vapor, and a water vapor permeation blocking portion for blocking the permeation of the water vapor, and configured by covering part of the outer surface of the water vapor detection portion with the water vapor permeation suppression portion and all of the rest of the outer surface of the water vapor detection portion with the water vapor permeation blocking portion.